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Doctor insights on: Allegra Allergy Side Effects

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Why will happen if you take a Claritin (loratadine) 24 hour and then 12 hours later take an allegra allergy pill?

Why will happen if you take a Claritin (loratadine) 24 hour and then 12 hours later take an allegra allergy pill?

Not serious: Since it takes several doses of a medication to get therapeutic levels, taking a second allergy medication too soon should not have any bad effects. You may have a few more side effects. ...Read more

Dr. John Chiu
2,479 doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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Can I take Advil Sinus Congestion and Pain with Allegra Allergy 24 hour together? I have a cold with nasal congestion.

Can I take Advil Sinus Congestion and Pain with Allegra Allergy 24 hour together? I have a cold with nasal congestion.

No benefit: Yes, but there is no added benefit to take the Allegra (fexofenadine) since it doesn't help much when you have a cold. An older antihistamine like Chlorpheneramine may help with runny nose but may cause drowsiness. ...Read more

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I started taking allegra (fexofenadine) d for my allergies my appetite decreased. Is this one of its side effects?

I started taking allegra (fexofenadine) d for my allergies my appetite decreased. Is this one of its side effects?

Could be related: Allegra (fexofenadine) d has not been usually associated with decreased appetite.The Pseudoephedrine which is the d part of the Allegra (fexofenadine) d can cause nausea in very few patients and if that is the symptom you are experiencing then you wont experience this with plain allegra (fexofenadine). ...Read more

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Are there any negative side effects if i take one 180mg allegra (fexofenadine) tablet daily for years? I have allergies all yr.

Are there any negative side effects if i take one 180mg allegra (fexofenadine) tablet daily for years? I have allergies all yr.

Probably not, but: New generation antihstamines are in general safe and effective. However, the best treatment for year round allergies is 1) avoidance of the allergic trigger; 2) antihistamines like allegra; 3) topical nasal steroid sprays (most effective); 4) allergy injections--will provide relief in majority of people and decrease need for medications. ...Read more

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What are the side effects of allegra (fexofenadine hcl) ?

Less common: All medications have side effects. Fexofenadine (allegra) is a newer or second generation anti-histamine. It does not cause usual side effects associated with older or first generation antihistamines such as drowsiness, dry mouth, urinary retention or palpitations. Some sensitive persons complains of mild drowsiness. Other listed side effects include headache, heart burn, muscle pain, somnolence. ...Read more

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Allegra-d side effects?

Allegra-d side effects?

Insomnia, jitters: Allegra d contains 2 drugs. Fexofenadine usually has few side effects, but can be drying to the nasal membranes and mouth, and can have side effects, so check further if you have some. The d portion, on the other hand, is sudafed, and it commonly causes jitters, insomnia, fast heart rate, nausea and headache. It can raise the blood pressure and cause arrhythmias. ...Read more

Dr. Ana Adelstein
334 doctors shared insights

Fexofenadine (Definition)

Fexofenadine, previously marketed under the brand name allegra, is an antihistamine similar to ...Read more


Dr. Michael Finkelstein
358 doctors shared insights

Allegra (Definition)

Allegra is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more